664652040 has 128 divisors (see below), whose sum is σ = 2159136000. Its totient is φ = 162708480.

The previous prime is 664652039. The next prime is 664652063. The reversal of 664652040 is 40256466.

It is a junction number, because it is equal to n+sod(n) for n = 664651992 and 664652010.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 309370 + ... + 311510.

It is an arithmetic number, because the mean of its divisors is an integer number (16868250).

Almost surely, 2^664652040 is an apocalyptic number.

664652040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664652040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1079568000).

664652040 is an abundant number, since it is smaller than the sum of its proper divisors (1494483960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664652040 is a wasteful number, since it uses less digits than its factorization.

664652040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2367 (or 2363 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 664652040 is about 25780.8463786587. The cubic root of 664652040 is about 872.6996075905.

The spelling of 664652040 in words is "six hundred sixty-four million, six hundred fifty-two thousand, forty".